Throttle-valve for fluid-pressure tools



H.-J. KIMMAN.

THROTTLE VALVE FOR FLUID PRESSURE TOOLS.

APPLICATION F lLED AUG.2I, 1919.

1,350. 102. Patented A g. 17, 1920.

2 SHEETS-SHEET I.

f W ZZL 1X25:

H. J. KIMMAN.

THROTTLE VALVE FOR FLUID PRESSURE TOOLS.

APPLICATION FILED AUG.2I, I919.

Patented Aug. 17, 1920.

2 SHEE'ISSHEET 2.

l pneumatic drills, hammers, etc.

1 will be described UNITED TSTATEFFSTPATENT OFFICE.

HENRY J. KIMMAN, 0F CLEVELAND, OHIOJASSIGNOB, TO CHICAGO PNEUMATIC TOO];

' COMPANY, OF CHICAGO, ILLINOIS A CORPORATION OF NEW JERSEY.

THROTTLE-VALVE FOR FLUID-PRESSURE TOOLS.

Specification of Letters Patent.

Application filed August 21, 1919. Serial No. 318,936.

To all whom it may concern:

Be it known that I, I'IENRY J. KIMMAN, a citizen of the United States, residingat Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Throttle- Valves, for F luidPressure Tools, of which the following is a specification.

My invention relates to a throttle valve for a tool operated by fluid pressure such as The object of my invention is to provide a throttle valve having features of safety whereby the throttle cannot be opened accidentally but only .intentionally when required for use. Laws of certain of the States require that tools of this character shall be made safe so as to protect the operator or workman from injury, and the throttle valve here produced by me is made to comply with such laws.

In the drawings Figure l is a top plan view of the fluid pressure or air conduit containing my safety throttle valve; Fig. 2 a side elevation thereof; Fig. 3 a view similar to Fig. 1 but with the oscillating shell removed to expose the parts within; Fig. 1 a central section on the line l4: of Fig. 1; Fig. 5 an elevation of the throttle valve removed; Fig. 6 a section on the line 66 of Fig. 4; and Fig- 7 a detail view showing a certain condition of the trigger with respect to the valve slide.

,My invention may partake of different embodiments without departing from the spirit of my invention and may moreover partake of different forms according to the particular use or tool to which it may be applied. In the present instance I have shown my invention embodied in a handle or conduit as applied to a drill such as a pneumatic drill, and for the sake of brevity and clearness of description, my invention in connection therewith. Moreover, my invention while more particularly intended for use in connection with air drills or air tools in general it will be understood that its use is not limited thereto. However, it will be understood that when I refer to the use of air that my in vention is not limited to tools employing such fluid pressure medium.

'My throttle valve 1 is in the present instance arranged in a passage 2 for fluid pressure which will be hereinafter referred to as air, which passage extends centrally through the conduit 3. adaptedfin the present instance to be secured .valve 1 is adapted the reduced side This conduit is at its left-hand end to the tool proper such as a drill and to receive the air under pressure from a suitable source through the nipple connection 4 at the right-hand end of the conduit.

The passage 2 is enlarged or eounterbored at its rearward or right-hand end so as to form a valve chamber :5 within which is by preference located a bushing 6. The throttle to slide within this bushing and to seat upon the rearward end thereof. The throttle valve consists of a cylin drical or tubular body portion which is cut away and also hollow as shown in Figs. 4., 5 and G and is provided with a head 7 which forms the valve proper and which is adapted to seat upon the seat 8' formed at the rearward end of the valve bushing. The valve is normally held. seated in suitable manner as by means of the coiled spring 9 hearing at one end against the nipple 4 and at the other end upon the valve head 7.

The throttle valve is provided with means whereby it may be operated which as shown consists of a stud 10 screwing into the body or guide portion of the valve and passing outwardly through a [longitudinal slot 11 extending through both the bushing 6 and of the conduit 3.

at a point radially of the valve chamber is longitudinally slotted to formthe recess 12 within which is adapted to reciprocate a valve slide 13 having a hole to receive the head of the stud 10. WVhen the slide 13 is reciprocated in a righthand direction by the means hereinafter described it will move the throttlevalve in the The conduit 3 same direction against the tension of the spring 9 and thereby open the passage throughth'e conduit and permit the air to pass to the tool.

vmove in the circumferential recess 15 in the conduit This head 14 has its forward edge formed oblique, that is inclined to the central longitudinal axis of the entire slide.

The operating means for the slide consists of an oscillating shell 16 and a hand or finger operated trigger 17 pivoted at 18 in said shell. By preference this shell is made Patented. Aug. 17, 1920.

V in two Separate sheet metal sections which are held together in detachable manner by the split rings 19 and 20 engaging circumferential grooves at the ends of these section s, which are themselves held in place against longitudinal displacement by the shoulder 21 formed in the conduit and also by the shoulder 22'formed by the forward end of the nipple 4. -This shell is adapted pivoted at 18 and extended through a slot 25 formed at one of the meeting edges of the two sections of the shell. The trigger is provided on its lower edge with an inwardly extending finger 26 normally positioned in the space within the recess 15 immediately in advance of the inclined end or face of the slide 13 as shown in' Fig. 3.

Describing the operation and starting with the parts in the normal position shown .in Fig. 4 for instance, when it is desired to admit air to the tool, the operator by pres-- sure of his hand or fingers forces the trigger inwardly so that the finger 26 will be positioned in front of the slide 13 and thereupon moves the shell and trigger in a clockwise direction with the result that by cam action between the finger 26 and end ofthe head 14 the slide 13 will be moved longitudinally to the right and the throttle valve will bethereby opened. The valveremains open so long as the operator maintains this pres sure and position of the trigger, but when the same is removed the spring '9 will restore=the parts to the "normal position and shutoff the supply of T As shown in Fig. 4 the side or face ofthe -finger26 which contacts the inclined or cam face of'the head 14 is inclined or beveled "with'the result that in the event that the shell should be oscillated accidentally or unintentionally without any pressure being exerted upon the trigger, such finger 26will 'ride-upwa'rdlyof the head 14 and move the trigger radially and thereby take the position upon the top or outer surface of the head 14 as shown in Fig. 7. Thus'the opening of the throttle valve is'dependent upon -two factors, first'the pressure of the operator upon the trigger so as'to-keep the finger 26' always in advance of the'cam face of the head 14, and secondthe oscillation-of the shell and finger. It is only by the combined *action o-f-thesetwo factors that the throttle gagement therewith.

5. The combination of a throttle valve, "and means for operating the same including valveis opened and consequently accidental operation cannot occur because an outside influence would affect only one .of the factors at a time and not both together. The

throttle valve is therefore of the safety type. and is reliable and eflicientfor this purpose.

It is moreover very simple in construction and can be readily assembled and disassembled for any desired purpose.

I claim: I

1. The combinationof a throttle valve and means foroperating the same including a member operatively connected with the valve, and a device having a rotary and a radial movement and adapted to be pressed into operative relationship with said mem- 1 her and then when rotated to actuate the latter to cause operation of thethrottle valve.

2. The combination of a throttle valve and means fol-operating the same includinga member operatively connected with the valve, and a pivoted lever having a rotary movement bodilyand adapted to be pressed into operative relationship with said member and then when rotated to actuate the latter to cause operation of the throttle valve. V V

3. The combination of a throttle valve and means for operating the same including a valve slide operatively connected with the valve and having a cam surface and alever which is mounted torotate bodily and which has a portion adaptedto cooperate with said cam surface to movetheslide longitudinally when in contact-therewith and-when rotated.

4. The combination of a throttle valve and means for operatingthe same including a valve slide operatively connected with the valve and having a cam surface and a rotarily mounted hand-operated lever having a projection provided with a cam surface adapted to cooperate with the other cam "surface to move the slide longitudinally, said surfaces being formed to cause the-lever when rotated, to ride out of engagement with the slide unless held pressed into ena valve slide operatively connected with the valve and consisting of a longitudinally sliding stem portion and a head portion having a cam edge, and a hand-operated bodily rotatable pivoted lever provided with a finger having a cam edge adapted to cooperate with the other cam edge and to move the slide longitudinally when the finger is held pressed into engagement with the slide.

' 6. The combination with atubular conduit having a fiuld pressure passage, a throttle valve therein to govern such passage, a valve SllClG mounted to slide on the 'COIlClHlt and operatively connected-with *t'he throttle valve, a rotatable member-mounted to oscillate by hand on the conduit, and a handoperated lever pivoted on said member and having a portion adapted to cooperate with the slide and move the same whenever the member is oscillated and the lever held pressed into engagement with the slide.

7. The combination with a tubular conduit having a fluid pressure passage, a throttle valve therein to govern such passage, a valve slide mounted to slide on the conduit and o eratively connected with the throttle valve, a shell mounted to oscillate by hand on the conduit, and a hand operated lever pivoted on said shell and having a portion adapted to cooperate with the slide and move the same whenever the shell is oscillated and the lever held pressed into engagement with the slide.

8. The combination with a tubular conduit having a fluid pressure passage, a throttle valve therein to govern such passage, a valve slide mounted to slide on the conduit and operatively connected with the throttle valve, a shell mounted to oscillate by hand on the conduit, and a hand operated lever pivoted on said shell and having a portion adapted to cooperate with the slide and move the same whenever the shell is oscillated and the lever held pressed into engagement with the slide, said shell being made in two detachable parts having at one set of the meeting edges a slot to receive the lever, and detachable means for holding the sections together.

9. The combination with a tubular conduit having a fluid pressure passage, a throttle .valve therein to govern such passage, a

valve slide mounted to slide on the conduit and operatively connected with the throttle valve, a rotatable member mounted to oscillate by hand on the conduit, and a hand operated lever pivoted on said shell and havirn a portion adapted to cooperate with the slide and move the same whenever the shell is oscillated and the lever held pressed into engagement with the slide, and means for limiting the oscillating movement of such shell.

10. The combination with a tubular conduit having a fluid pressure passage, a throttle valve therein to govern such passage, a valve slide mounted to slide 011 the conduit and operatively connected with the throttle valve, a shell mounted to oscillate by hand on the conduit, and a hand operated lever pivoted on said shell and having a portion adapted to cooperate with the slide and move the same whenever the shell is oscillated and the lever held pressed into engagement with the slide, and means for limiting the oscillating movement of such shell comprising a projection on the conduit and a cooperating groove on the inner surface of the shell.

11. The combination of a throttle valve and means for operating the same including a member operatively connected with the valve, said member and device coacting to cause said device when rotated to ride out of engagement with such member unless pressed into engagement therewith.

HENRY J. KIMMAN. 

